> On Apr 18, 2016, at 08:36 , Peter Ujfalusi <peter.ujfalusi@xxxxxx> wrote: > > On 04/04/2016 11:59 AM, Rick Mann wrote: >> I've got a Beaglebone Green with a custom cape (CODEC and amp and some >> other stuff). >> >> Kernel 4.4.6-bone-rt-r6. When I load the overlay that should set up my >> CODEC in the device tree, I get the following in the log. >> >> [ 367.172337] davinci-mcasp 48038000.mcasp: stream has more channels (2) >> than are enabled in mcasp (0) [ 367.172374] davinci-mcasp 48038000.mcasp: >> ASoC: can't set 48038000.mcasp hw params: -22 >> >> You can see a little more log context, along with the DTS, here: >> >> http://pastebin.com/UPB1xjPF >> >> Can anyone tell me what this means? Thanks! > > The fragment mostly looks OK, but am335x have 4 serializers, not 16 and the > num-serializer is deprecated at least in upstream kernel. > > Something goes wrong when the McASP is loaded for sure, some parameters did > not got updated via DT perhaps, or most likely the DT fragment is loaded after > the McASP is loaded. > Can you print out: > slots, max_active_serializers, active_serializers and channels in > mcasp_common_hw_param() function? > Also just in case, can you put a dev_err() print in davinci_mcasp_probe() to > see when the driver is loaded compared to the time when the fragment is loaded? > > If McASP is built in, try to build it as module and load the audio modules > after the DT fragments are handled. Thanks for the suggestions, Peter, I really appreciate the help. Here's what I get: [ 256.743991] davinci-mcasp 48038000.mcasp: Slots: 2, max_active_serializers: 1, active_serializers: 0, channels: 2 I rebuilt the 4.4.7-bone-rt-r9 kernel using Robert C Nelson's bb-kernel repo scripts. I modified sound/soc/davinci/davinci-mcasp.c to print some diagnostics. Rebooted, then executed the following. Note that BB-BONE-AUDI-02.dts is <https://github.com/RobertCNelson/bb.org-overlays/blob/master/src/arm/BB-BONE-AUDI-02-00A0.dts>, and the base DTB is <http://pastebin.com/5vVEdAKt>: $ sudo su # echo BB-BONE-AUDI-02 > $SLOTS # aplay -l **** List of PLAYBACK Hardware Devices **** card 0: B [AudioCape Rev B], device 0: davinci-mcasp.0-tlv320aic3x-hifi tlv320aic3x-hifi-0 [] Subdevices: 1/1 Subdevice #0: subdevice #0 # speaker-test speaker-test 1.0.28 Playback device is default Stream parameters are 48000Hz, S16_LE, 1 channels Using 16 octaves of pink noise Rate set to 48000Hz (requested 48000Hz) Buffer size range from 16 to 32768 Period size range from 8 to 16384 Using max buffer size 32768 Periods = 4 Unable to set hw params for playback: Invalid argument Setting of hwparams failed: Invalid argument speaker-test caused the following to be logged: [ 256.743991] davinci-mcasp 48038000.mcasp: Slots: 2, max_active_serializers: 1, active_serializers: 0, channels: 2 [ 256.754343] davinci-mcasp 48038000.mcasp: ASoC: can't set 48038000.mcasp hw params: -22 Full logs: http://pastebin.com/HGhu9CPk -- Rick Mann rmann@xxxxxxxxxxxxxxx _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
